Struggling with Diets and Health Issues: Need Advice

My parents have pushed diets and healthy eating my whole life, I was raised vegan and then vegetable based, gluten free. You'd think it would be a good thing but I'm just so sick of it. My health has been a problem a lot as I've gone into adulthood and I'm pursuing diagnosis of RA or EDS, lots of chronic joint pain and stomach troubles. At Drs instruction they recommended a low-gluten diet and now my parents are back on their diet kicks and everything that I experience symptom wise is now related to what I eat. Is that a thing? Is every single symptom I'm feeling the result of putting something in my body? I'm just lost and I need someone to help or discuss. Cuz now I feel like I should diet and cut everything out and it's my fault that I haven't yet and that's why I feel like such crap all the time.